Common causes and brief descriptions
Anal swelling may be due to haemorrhoids, perianal abscesses, pilonidal cysts, anal warts (condyloma), or benign skin cysts. Infections cause local inflammation and swelling, while persistent straining or increased venous pressure can enlarge veins and produce haemorrhoids. Each cause has distinct features—for example, an abscess is often painful and may be associated with fever, whereas warts have a rough surface.





